package juc.day02;

/*
生产者和消费者案例
 */
public class TestProductorAndConsumer {

    public static void main(String[] args) {
        Clerk clerk = new Clerk();
        Productor pro = new Productor(clerk);
        Consumer con = new Consumer(clerk);

        new Thread(pro, "生产者A").start();
        new Thread(con, "消费者B").start();

        new Thread(pro, "生产者C").start();
        new Thread(con, "消费者D").start();


    }
}


//店员
class Clerk {
    private int product = 0;

    //进货
    public synchronized void get() {//循环次数：1
        while (product >= 1) {//虚假唤醒问题，wait应该使用在循环中
            System.out.println("产品已满，无法添加");
            try {
                this.wait();//若产品大于10则表示货满，此时暂停线程不允许操作product
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println(Thread.currentThread().getName() + " : " + ++product);
        this.notifyAll();//若产品小于0则表示缺货，此时唤醒其他线程

    }

    //卖货
    public synchronized void sale() {//product = 0；循环次数：0
        while (product <= 0) {
            System.out.println("缺货");
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println(Thread.currentThread().getName() + " : " + --product);
        this.notifyAll();

    }
}

//生产者
class Productor implements Runnable {
    private Clerk clerk;

    public Productor(Clerk clerk) {
        this.clerk = clerk;
    }

    @Override
    public void run() {
        for (int i = 0; i < 20; i++) {
            try {
                Thread.sleep(200);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            clerk.get();
        }
    }
}

//消费者
class Consumer implements Runnable {
    private Clerk clerk;

    @Override
    public void run() {
        for (int i = 0; i < 20; i++) {

            clerk.sale();
        }
    }

    public Consumer(Clerk clerk) {
        this.clerk = clerk;
    }
}
